I heckin love the graphics and sound style of C&C 1 (Tiberian Dawn). It has IMO aged really well, too - I didn't expect that at the time. Only the CGI FMV sequences have not aged well. The parts with actors are alright, especially with General Sheppard.
Doom has also aged surprisingly well. It was a generally acknowledged instant classic at the time, and it is a classic now.
(I still play both games occasionally. OG C&C but in SVGA resolution and Doom with modern engines, recently mostly with the Brutal Doom mod.)